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Re: breaker meltdown [Re: mikes733] #204477 12/12/11 03:51 PM
Joined: Apr 2002
Posts: 7,178
HotLine1 Offline
I remember the thin GE 120/240 volt, and Murray/Bryant types, having burn-out issues, back in the day.

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Re: breaker meltdown [Re: mikes733] #204479 12/12/11 07:50 PM
Joined: Dec 2000
Posts: 4,283
electure Offline
Originally Posted by mikes733
I did sand the buss and applied corrosion inhibiter with the new breaker.

Aluminum busbars have a tin plating that is less than .0006".

Be careful when sanding busbars, or you'll sand right through this plating wink

Re: breaker meltdown [Re: mikes733] #204480 12/12/11 08:49 PM
Joined: Apr 2002
Posts: 7,178
HotLine1 Offline
Six ten-thousandths would be very, very difficult to not damage.

Re: breaker meltdown [Re: HotLine1] #204518 12/16/11 04:34 PM
Joined: Nov 2007
Posts: 763
KJay Offline

From what I can see, simply installing the push in breakers looks like it is enough to scratch the coating on the aluminum busses. IDK, maybe that is the manufacturer’s intent. The salt air on the water front around here just seems to annihilate those aluminum panel busses.
Seems some manufacturers make the effort put a little dab of inhibitor or grease on their CB pressure contacts, while others leave theirs completely dry. I would think that the inhibitor should help keep out moisture and make more of a so called oxygen free connection, but maybe not.
I will still install the Siemens panels with the aluminum buss, but will usually try and get them with the copper buss if possible, since the price isn’t that much more.

Re: breaker meltdown [Re: mikes733] #204519 12/16/11 10:30 PM
Joined: Jun 2004
Posts: 1,273
Tesla Offline

I've witnessed the effect of near-ocean air on aluminum bussing: it's tremendous.

One can observe 2-4% voltage drops right there.

The heat from this is not trivial.


FYI: Chlorine attacks aluminum VERY vigorously. That is why aluminum can't be used for Ufers.

In some Nevada locations ground salts are so intense you have to stay with copper for everything. ( It used to be at the bottom of the ocean -- hence the salt flats in Utah and Nevada. )

If the installation is near the ocean just forget about using aluminum bussing -- aluminum anything.


Try this: place an old aluminum lug in a glass of salted water.

Let it sit and watch just how fast it is destroyed. Any acid will REALLY speed the effect up.

Re: breaker meltdown [Re: mikes733] #217642 09/24/16 03:42 AM
Joined: Sep 2006
Posts: 155
crselectric Offline
Im working on a siemans panel in the bay area whwere the fog seems to come in HO called that the washer/dryer was having trouble and she had some guy out who checked a few things and went away. problem was still was intermittant, would lose power to run and the LG electronics on the units would start flashing wildly. I came out and the interior cover from the main outside panel was missing, they said its been like that ever since they moved in 3 years ago, the buss was corroded something awful and the suspect breaker was almost welded to the buss, the circuit wiring was new since they had the furnace and water heater moved.....its a ite panel at least that is the maker on the 100 amp main this is the older panel where the buss is against the outside wall. newer ones theyve moved it to the main/load divider partition. any experience with these panels and loose breakers or under thickness buss some breakers seem a little loose? CRS

Re: breaker meltdown [Re: mikes733] #217644 09/27/16 10:30 PM
Joined: Oct 2000
Posts: 5,389
sparky Offline
CRS, I would imagine a coastal environment juxtaposed to a missing panel cover would warrant it's replacement


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